. >>> in tunisia angry demonstrators facing off with police after a critic of the government was shot and killed. police fired tear gas to break up the protest. the demonstrations broke out after a gunman shot -- his supporters and opponents are calling this a political assassination. >>> acapulco, mexico attracting millions of tourists every year. this horrifying crime has put folks on edge. particularly visitors, miguel marquez is in acapulco with some new developments. what do we know? >> reporter: suzanne, this is the beautiful area just south of acapulco, where this crime occurred. this is the house where those victims were. tape surrounds it as well as many police. cnn learned from the lead investigator of this investigation, the victims knew their attackers. he says they bought drugs from him mass gunmen entered the bungalow from the beach around 2:00 a.m. what happened next, horrific. six women in their 20s and their male companions tied up. the women raped, the men helpless to stop it from happening. it's a delicate situation, he says, but we will apply the full weight of the